/*******************************************************************************
 * Developer: Ian Doyle
 * Date:      6/23/2012
 *
 * All code Copyright (C) 2012 Ian Doyle. All rights reserved.
 *
 * This file is a part of FileFocus.
 *
 * FileFocus is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * FileFocus is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with FileFocus.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/

package filefocus;

import java.io.File;
import java.io.FilenameFilter;
import java.util.HashSet;

public class WhiteBlackListFileFilter extends HashSet<String> implements FilenameFilter {
	
	/**
	 * 
	 */
	private static final long serialVersionUID = 8746756570540372530L;

	public static enum FilterType {
		WHITELIST,
		BLACKLIST
	} 
	
	private FilterType type;
	
	public WhiteBlackListFileFilter(String[] extensions, FilterType filterType)
	{
		type = filterType;
		for(int i = 0; i < extensions.length; ++i)
		{
			add(extensions[i].toLowerCase());
		}
	}

	@Override
	public boolean accept(File arg0, String arg1)
	{
		int index = arg1.lastIndexOf(".");
		String fileExtension = (index >= 0) ? arg1.substring(index + 1).toLowerCase() : "";
		switch (type) {
			case WHITELIST:
				return contains(fileExtension);
			case BLACKLIST:
				return !contains(fileExtension);
			default:
				return false;
		}
	}

	public FilterType getFilterType()
	{
		return type;
	}
}
